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Spoiler alert!!!
Since you're asking for spoilers I'll you.
Won used MC's bro as a substitute since he couldn't be near him. The MC was a minor at that time, but he too liked Won but couldn't figure it out. Later he lost his memory and stuff due to an accident caused by this brother that's why he has no memory of Won. It's really messed up to be honest but the characters and their trauma are complex so due try reading it. I won't blame you for not finishing it. Hope this info helps.

Spoiler alert!!!
Since you're asking for spoilers I'll give you some info.
Won used MC's bro as a substitute since he couldn't be near him. The MC was a minor at that time, but he too liked Won but couldn't figure it out. Later he lost his memory and stuff due to an accident caused by this brother that's why he has no memory of Won. It's really messed up to be honest but the characters and their trauma are complex so due try reading it. I won't blame you for not finishing it. Hope this info helps.
So did Won ever like the brother? Is he dating MC as a substitute? I need to know; because, the comments are soo vague :,)